CN112919698A - Method for removing sulfate radical in wastewater by non-membrane method - Google Patents
Method for removing sulfate radical in wastewater by non-membrane method Download PDFInfo
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Images
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention provides a method for removing sulfate radicals in wastewater by a non-membrane method, which comprises the steps of forming precipitates by sulfate radicals, heavy metal ions and a coagulant in the wastewater to primarily remove the sulfate radicals; after entering an electrooxidation complexing device, performing electrooxidation complexing under the action of a thickening agent to preliminarily generate a sulfate-containing composite complex salt precipitate; aging in a stirring pool and further generating a sulfate-containing composite complex salt precipitate under the action of a coagulant aid. The invention aims to solve the problem of removing sulfate radicals from wastewater, and adopts a method for removing sulfate radicals from wastewater by a non-membrane method.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a method for removing sulfate radicals in wastewater by a non-membrane method.
Background
Water resources and coal resources in China are distributed in a reverse direction, a mining area is located in the water-deficient area of the northwest five provinces, coal mining damages the stratum, an underground water flow field and the ground surface of the mining area, natural water sources are cut off, or underground water resources flow into a goaf to form mine water, so that underground water storage is lost, the ecological environment is seriously damaged, and effective utilization of the mine water becomes a first thing which influences water consumption of the mining area and even the whole water-deficient area. Therefore, the area of the coal mine puts forward a higher standard for the quality of the treated mine water, and even meets the requirement of the ground surface III-class water standard, so that the mine water which can reach the standard originally cannot meet the environmental protection requirement due to the fact that a small amount of pollutants exceed the standard, and coal enterprises bear huge environmental protection pressure in the aspect of mine water treatment.
In 2018, for example, in a Mongolia autonomous region, an original water outlet of the region is closed, and waste water is not discharged into a surface water source any more or the water discharge quality reaches the standard of surface III class water. The standard-reaching treatment of a large amount of salt-containing mine drainage generated along with coal mining faces difficulty, the traditional physicochemical method is difficult to perform the standard-reaching treatment on the mine water with large water volume and low pollutant concentration, and a more advanced and expensive treatment means has to be selected.
At present, with the development of membrane filtration technology, membrane treatment technology is widely applied to the fields of zero discharge of wastewater and seawater desalination, and can remove salt ions in water more thoroughly, but the application of the current process in mine drainage treatment has the following defects: the investment and operation cost are high, the average water yield is low, the price of the membrane component is high, and the pollution is easy; meanwhile, part of minerals beneficial to human bodies are removed in the desalting process, and the salt is not suitable for being used as drinking water for a long time.
Mine water contains a large amount of salt, SO4 2-Are commonly found in mine drainage. The physical and chemical properties of highly mineralized or acidic mine water are greatly different, but the common characteristic is that sulfide exists, mainly pyrite (FeS)2) Is oxidized to generate SO in water4 2-Has a high concentration of SO of some mine water4 2-The content of (A) is hundreds to tens of thousands of mg/L, which greatly exceeds the upper limit standard of 250mg/L of drinking water. Containing SO4 2-In the evolution process of mine water, Ca in the water is caused by the corrosion effect of the mine water on surrounding rocks2+、Mg2+The content of ions increases, thereby making the total hardness of water larger. China contains a large amount of SO4 2-The acidic mine water is basically treated by a neutralization chemical method, and alkaline agents are added or limestone and dolomite are taken as filter materials for filtration and neutralization. However, the equipment of the neutralization method is complex, large in noise, poor in environmental conditions and serious in secondary pollution. Reaction product CaSO4Mixed with excess limestone, are difficult to handle and difficult to handle by precipitating CaSO4Adding SO4 2-The concentration of (A) is reduced to below 250mg/L, and SO can be further precipitated by a neutralization method only after the membrane method salt separation concentration4 2-But the membrane method has large using amount of softening agent and high investment and operation cost,the average water yield is low, and the membrane component is easy to be polluted and blocked.
Therefore, it is urgently needed to develop a method for removing sulfate, which has simple operation conditions and low treatment cost and can bear large-amount inflow water.
Disclosure of Invention
The invention aims to solve the problem of removing sulfate radicals from wastewater, and adopts a method for removing sulfate radicals from wastewater by a non-membrane method.
The invention provides a method for removing sulfate radicals in wastewater by a non-membrane method, which comprises the following steps:
s1, primary sulfate radical removal: enabling the sulfate radical-containing wastewater A to flow into a coal slime pretreatment device for pretreatment clarification, enabling the wastewater A to enter a coagulation dosing tank through a first buffer tank, enabling sulfate radicals, heavy metal ions and a coagulant in the wastewater A to form precipitates to obtain coagulation wastewater, and enabling supernatant after the coagulation wastewater enters a sedimentation tank for sedimentation to be wastewater B for primarily removing the sulfate radicals;
s2, electro-oxidation complexing: the wastewater B enters a second buffer pool to form a mixed solution with a thickening agent and then enters an electrochemical oxidation complexing device, and the mixed solution initially generates wastewater C containing sulfate radical complex salt precipitate under the action of an electric field;
s3, aging and precipitating: and (3) allowing the wastewater C to enter a stirring tank for aging, further generating a sulfate radical-containing composite complex salt precipitate under the action of a coagulant aid, discharging the sulfate radical-containing composite complex salt precipitate from a sludge discharge port after the sulfate radical-containing composite complex salt precipitate is settled, discharging supernatant, namely the sulfate radical-removed wastewater D from a water production port, and finishing the sulfate radical removal in the wastewater by a non-membrane method.
According to the method for removing sulfate radicals in wastewater by the non-membrane method, as a preferable mode, the electrochemical oxidation complexing device comprises a plate electrode.
In the method for removing sulfate radicals in wastewater by a non-membrane method, the coagulant in step S1 is lime, and the precipitates formed by the sulfate radicals, heavy metal ions and the coagulant in the wastewater A are calcium sulfate precipitates and heavy metal hydroxide precipitates.
In the method for removing sulfate radicals in wastewater by using an non-membrane method, the thickener in the step S2 is hydrotalcite or hydrotalcite-like compound as a preferable mode;
the thickener is decomposed into divalent metal oxide and trivalent metal oxide under the action of the electric field of the electrochemical oxidation complexing device, and high-concentration sulfate and excessive lime in the mixed solution are used as media under the continuous action of the electric field to form sulfate-containing composite complex salt precipitate.
In a preferred embodiment of the method for removing sulfate radicals from wastewater by a non-membrane method of the present invention, the sulfate radical-containing complex salt is precipitated as ettringite in steps S2 and S3.
According to the method for removing sulfate radicals in wastewater by using the non-membrane method, as a preferred mode, the hydrotalcite is calcium-aluminum hydrotalcite or magnesium-aluminum hydrotalcite;
the distance between the plate electrodes is 10-50 cm, and the plate electrodes are aluminum electrodes, stainless steel electrodes or copper electrodes.
According to the method for removing sulfate radicals in wastewater by using the non-membrane method, as a preferable mode, in the step S1, the sulfate radical-containing wastewater is sulfate radical-containing mine water;
in the step S2, electrifying the mixed solution in the electrochemical oxidation complexing device for reaction time of 10 min-5 h;
in step S3, the aging time is 10 min-48 h.
In the method for removing sulfate radicals from wastewater by a non-membrane method, as a preferred mode, in step S3, the coagulant aid is one or more of aluminum salt, iron salt or polyacrylamide.
The invention relates to a method for removing sulfate radicals in wastewater by a non-membrane method, which is characterized in that a coal slime pretreatment device, a first buffer tank, a coagulation dosing tank, a sedimentation tank, a second buffer tank, an electrochemical oxidation complexing device and a stirring tank are sequentially connected as an optimal mode;
the coal slime pretreatment device is used for carrying out pretreatment clarification to the waste water A that contains the sulfate radical, first buffer pool is used for slowing down waste water A's velocity of flow, it adds the medicine pond and is used for throwing the coagulant in waste water A to make the sulfate radical, heavy metal oxide forms the sediment and obtains the waste water that thoughtlessly congeals to obtain, the sedimentation tank is used for clarifying the waste water that thoughtlessly congeals obtains the waste water B who tentatively gets rid of the sulfate radical, the second buffer pool is used for slowing down waste water B's velocity of flow and adds the thickener and form mixed solution, electrochemistry oxidation complexing device is used for generating the waste water C that contains the sulfate radical complex salt sediment under the effect of electric field with mixed solution tentatively, the stirring tank is used for adding coagulant aid and further generates the compound complex salt sediment that contains the sulfate radical after making waste water C age, the stirring tank is used for inciting some.
The invention relates to a method for removing sulfate radicals in wastewater by a non-membrane method, which is a preferable mode, wherein a stirring tank comprises a body, and a water inlet, a dosing port, a sludge discharge port and a water production port which are arranged on the body, wherein the water inlet is connected with an electrochemical oxidation complexing device, the dosing port is used for dosing a coagulant aid, the sludge discharge port is used for discharging sulfate radical-containing composite complex salt precipitate, and the water production port is used for discharging wastewater D.
The implementation mode is as follows: the mine water containing sulfate radicals enters a first buffer tank after being pretreated and clarified, and lime is added as a coagulant to form calcium sulfate precipitate and heavy metal hydroxide precipitate so as to primarily remove sulfate radicals, most of metal ions and other impurities. After precipitation treatment, the supernatant enters a second buffer tank with a stirrer, a polyvalent metal thickener (hydrotalcite or hydrotalcite-like compound, such as calcium aluminum hydrotalcite or magnesium aluminum hydrotalcite) is added, after mixing, the solution is sent into an electrooxidation complexing device, the device is a plate electrode, the electrode spacing is 10-50 cm, the device is one of an aluminum electrode, a stainless steel electrode and a copper electrode, preferably the aluminum electrode, after electrifying reaction is carried out for 10 min-5 h, the solution enters a stirring tank for aging, the aging time is 10 min-48 h, one or more coagulant aids (aluminum salt, ferric salt or polyacrylamide) are added, effluent is obtained after precipitation, and sludge generated by the process is sulfate radical-containing composite salt precipitate which can be used as a raw material in the commercial industry, such as road fillers and other building materials using GYPSUM materials.
The chemical principle is as follows: hydrotalcite is decomposed into M under the action of electric field2+O and M3+O metal oxide, then under the action of electric field, in high concentration of sulfate and excess of Ca (OH)2As a medium, a new complex salt precipitate is formed again, mainly comprising ettringite: 3 CaO. Al2O3·3CaSO4·32H2O。
The invention has the following advantages:
(1) the method is simple, the investment and operation cost is low, the adopted pretreatment device, the buffer tank, the sedimentation tank, the electrochemical oxidation complexing device and the stirring tank are devices with lower cost and easy maintenance, and the treatment method is simple and easy to operate.
(2) The removal effect is good, the content of the removed calcium sulfate is lower than 130mg/L, the standard of surface III type water is achieved, and the subsequent membrane method for salt separation and concentration is not needed, so that the use of softening agents is reduced, and the water yield is increased.
(3) The sludge produced by the process is sulfate-containing composite salt precipitate, and can be used as a raw material for commercial industries, such as road fillers and other building materials using GYPSUM materials.
Drawings
FIG. 1 is a flow diagram of a process for the non-membrane removal of sulfate radicals from wastewater;
FIG. 2 is a diagram showing the configuration of an apparatus for a method for removing sulfate radicals from wastewater by a non-membrane method.
Reference numerals:
1. a coal slime pretreatment device; 2. a first buffer pool; 3. a coagulation dosing tank; 4. a sedimentation tank; 5. a second buffer pool; 6. an electrochemical oxidation complexing device; 7. a stirring tank; 71. a body; 72. a water inlet; 73. a medicine adding port; 74. a sludge discharge port; 75. and (4) producing a water gap.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
As shown in fig. 1, a method for removing sulfate radicals from wastewater by a non-membrane method comprises the following steps:
s1, primary sulfate radical removal: enabling the sulfate radical-containing wastewater A to flow into a coal slime pretreatment device 1 for pretreatment clarification, then enabling the wastewater A to enter a coagulation dosing tank 3 through a first buffer tank 2, enabling sulfate radicals, heavy metal ions and a coagulant in the wastewater A to form precipitation to obtain coagulation wastewater, and enabling supernatant after the coagulation wastewater enters a sedimentation tank 4 for sedimentation to be wastewater B for primarily removing the sulfate radicals;
s2, electro-oxidation complexing: the wastewater B enters a second buffer pool 5 to form a mixed solution with a thickening agent and then enters an electrochemical oxidation complexing device 6, and the mixed solution initially generates wastewater C containing sulfate radical complex salt precipitate under the action of an electric field;
s3, aging and precipitating: and (3) allowing the wastewater C to enter a stirring tank 7 for aging, further generating a sulfate radical-containing composite complex salt precipitate under the action of a coagulant aid, discharging the sulfate radical-containing composite complex salt precipitate from a sludge discharge port 74 after the precipitate is settled, discharging supernatant, namely the sulfate radical-removed wastewater D from a water production port 75, and finishing the sulfate radical removal of the wastewater by a non-membrane method.
Example 2
As shown in fig. 1, a method for removing sulfate radicals from wastewater by a non-membrane method comprises the following steps:
s1, primary sulfate radical removal: enabling the sulfate radical-containing wastewater A to flow into a coal slime pretreatment device 1 for pretreatment clarification, then enabling the wastewater A to enter a coagulation dosing tank 3 through a first buffer tank 2, enabling sulfate radicals, heavy metal ions and lime in the wastewater A to form calcium sulfate precipitates and heavy metal hydroxide precipitates to obtain coagulation wastewater, and enabling the coagulation wastewater to enter a sedimentation tank 4 for sedimentation to obtain supernatant, namely wastewater B for primarily removing sulfate radicals;
s2, electro-oxidation complexing: the wastewater B enters a second buffer tank 5 to form a mixed solution with hydrotalcite or hydrotalcite-like compound, and then enters an electrochemical oxidation complexing device 6, and the mixed solution initially generates wastewater C containing calcium aluminite under the action of an electric field;
the electrochemical oxidation complexing device 6 comprises a plate electrode; the distance between the plate electrodes is 10-50 cm, and the plate electrodes are aluminum electrodes or stainless steel electrodes or copper electrodes;
the hydrotalcite is calcium-aluminum hydrotalcite or magnesium-aluminum hydrotalcite;
s3, aging and precipitating: and (3) allowing the wastewater C to enter a stirring tank 7 for aging, further generating a sulfate radical-containing composite complex salt precipitate under the action of a coagulant aid, discharging the sulfate radical-containing composite complex salt precipitate from a sludge discharge port 74 after the precipitate is settled, discharging supernatant, namely the sulfate radical-removed wastewater D from a water production port 75, and finishing the sulfate radical removal of the wastewater by a non-membrane method.
Example 3
As shown in fig. 1, a method for removing sulfate radicals from wastewater by a non-membrane method comprises the following steps:
s1, primary sulfate radical removal: the mine water A containing sulfate radicals flows into a coal slime pretreatment device 1 for pretreatment clarification, then enters a coagulation dosing tank 3 through a first buffer tank 2, sulfate radicals, heavy metal ions and lime in the mine water A form calcium sulfate precipitates and heavy metal hydroxide precipitates to obtain coagulation wastewater, and supernatant after the coagulation wastewater enters a sedimentation tank 4 for sedimentation is wastewater B for primarily removing the sulfate radicals;
s2, electro-oxidation complexing: the wastewater B enters a second buffer tank 5 to form a mixed solution with hydrotalcite or hydrotalcite-like compound, and then enters an electrochemical oxidation complexing device 6, and the mixed solution initially generates wastewater C containing calcium aluminite under the action of an electric field;
the electrochemical oxidation complexing device 6 comprises a plate electrode; the distance between the plate electrodes is 10-50 cm, and the plate electrodes are aluminum electrodes or stainless steel electrodes or copper electrodes; electrifying for reaction for 10 min-5 h;
the hydrotalcite is calcium-aluminum hydrotalcite or magnesium-aluminum hydrotalcite;
s3, aging and precipitating: the wastewater C enters a stirring tank 7 for aging, and a sulfate-containing complex salt precipitate is further generated under the action of one or more of aluminum salt, ferric salt or polyacrylamide, and the aging time is 10 min-48 h; the compound complex salt containing sulfate radicals is discharged from a sludge discharge port 74 after being precipitated and settled, the supernatant fluid is the wastewater D for removing the sulfate radicals and is discharged from a water production port 75, and the removal of the sulfate radicals in the wastewater by the non-membrane method is finished.
The chemistry of examples 1-3 is: hydrotalcite is decomposed into M under the action of electric field2+O and M3+O metal oxide, then under the action of electric field, in high concentration of sulfate and excess of Ca (OH)2As a medium, a new complex salt precipitate is formed again, mainly comprising ettringite: 3 CaO. Al2O3·3CaSO4·32H2O。
As shown in fig. 2, in examples 1 to 3: the coal slime pretreatment device 1, the first buffer tank 2, the coagulation dosing tank 3, the sedimentation tank 4, the second buffer tank 5, the electrochemical oxidation complexing device 6 and the stirring tank 7 are sequentially connected;
the coal slime pretreatment device 1 is used for carrying out pretreatment clarification on sulfate radical-containing wastewater A, the first buffer tank 2 is used for slowing down the flow velocity of the wastewater A, the coagulation dosing tank 3 is used for dosing a coagulant into the wastewater A to precipitate sulfate radicals and heavy metal oxides to obtain coagulation wastewater, the sedimentation tank 4 is used for clarifying the coagulation wastewater to obtain wastewater B which primarily removes sulfate radicals, the second buffer tank 5 is used for slowing down the flow velocity of the wastewater B and adding a thickener to form a mixed solution, the electrochemical oxidation complexing device 6 is used for primarily generating the wastewater C containing sulfate radical complex salt precipitates under the action of an electric field, the stirring tank 7 is used for adding a coagulant aid and aging the wastewater C to further generate sulfate radical-containing complex salt precipitates, the stirring tank 7 is used for discharging the sulfate radical-containing complex salt precipitates, and the stirring tank 7 is used for discharging the wastewater D;
the stirring tank 7 comprises a body 71, a water inlet 72, a dosing port 73, a sludge discharge port 74 and a water production port 75 which are arranged on the body 71, wherein the water inlet 72 is connected with the electrochemical oxidation complexing device 6, the dosing port 73 is used for adding coagulant aids, the sludge discharge port 74 is used for discharging sulfate-containing composite complex salt precipitate, and the water production port 75 is used for discharging wastewater D.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A method for removing sulfate radical in wastewater by a non-membrane method is characterized in that: the method comprises the following steps:
s1, primary sulfate radical removal: enabling the sulfate radical-containing wastewater A to flow into a coal slime pretreatment device (1), performing pretreatment clarification, and then enabling the wastewater A to enter a coagulation dosing tank (3) through a first buffer tank (2), wherein sulfate radicals, heavy metal ions and a coagulant in the wastewater A form precipitates to obtain coagulation wastewater, and a supernatant obtained after the coagulation wastewater enters a precipitation tank (4) and is wastewater B with sulfate radicals removed preliminarily;
s2, electro-oxidation complexing: the wastewater B enters a second buffer pool (5) to form a mixed solution with a thickening agent and then enters an electrochemical oxidation complexing device (6), and the mixed solution initially generates wastewater C containing sulfate radical complex salt precipitate under the action of an electric field;
s3, aging and precipitating: and the wastewater C enters a stirring tank (7) for aging and further generates a sulfate radical-containing composite complex salt precipitate under the action of a coagulant aid, the sulfate radical-containing composite complex salt precipitate is discharged from a sludge discharge port (74) after being settled, the supernatant, namely the sulfate radical-removed wastewater D is discharged from a water production port (75), and the removal of sulfate radicals in the wastewater by a non-membrane method is completed.
2. The method for removing sulfate radicals from wastewater by a non-membrane method according to claim 1, characterized in that: the electrochemical oxidation complexing device (6) comprises a plate electrode.
3. The method for removing sulfate radicals from wastewater by a non-membrane method according to claim 2, characterized in that: in the step S1, the coagulant is lime, and the precipitates formed by the sulfate radicals, the heavy metal ions and the coagulant in the wastewater a are calcium sulfate precipitates and heavy metal hydroxide precipitates.
4. The method for removing sulfate radicals from wastewater by a non-membrane method according to claim 3, characterized in that: in the step S2, the thickening agent is hydrotalcite or hydrotalcite-like compound;
the thickening agent is decomposed into divalent metal oxide and trivalent metal oxide under the action of the electric field of the electrochemical oxidation complexing device (6), and high-concentration sulfate and excessive lime in the mixed solution are used as media under the continuous action of the electric field to form the sulfate-containing composite complex salt precipitate.
5. The method for removing sulfate radicals from wastewater by a non-membrane method according to claim 4, characterized in that: in steps S2 and S3, the sulfate group-containing complex salt precipitates as ettringite.
6. The method for removing sulfate radicals from wastewater by a non-membrane method according to claim 3, characterized in that: the hydrotalcite is calcium-aluminum hydrotalcite or magnesium-aluminum hydrotalcite;
the distance between the plate electrodes is 10-50 cm, and the plate electrodes are aluminum electrodes, stainless steel electrodes or copper electrodes.
7. The method for removing sulfate radicals from wastewater by a non-membrane method according to claim 1, characterized in that:
in step S1, the sulfate radical-containing wastewater is sulfate radical-containing mine water;
in the step S2, electrifying the mixed solution in the electrochemical oxidation complexing device (6) for reaction for 10 min-5 h;
in step S3, the aging time is 10 min-48 h.
8. The method for removing sulfate radicals from wastewater by a non-membrane method according to claim 1, characterized in that: in step S3, the coagulant aid is one or more of aluminum salt, iron salt, or polyacrylamide.
9. The method for removing sulfate radicals from wastewater by a non-membrane method according to claim 1, characterized in that: the coal slime pretreatment device (1), the first buffer tank (2), the coagulation dosing tank (3), the sedimentation tank (4), the second buffer tank (5), the electrochemical oxidation complexing device (6) and the stirring tank (7) are sequentially connected;
coal slime preprocessing device (1) is used for containing the sulfate radical waste water A carries out the preliminary treatment clarification, first buffer pool (2) are used for slowing down waste water A's velocity of flow, thoughtlessly add medicine pond (3) be used for to throw with in the waste water A coagulant makes sulfate radical, heavy metal oxide form the sediment and obtains thoughtlessly congeal waste water, sedimentation tank (4) are used for with thoughtlessly congeal waste water clarification and obtain tentatively getting rid of the sulfate radical waste water B, second buffer pool (5) are used for slowing down waste water B's velocity of flow and add the thickener forms the mixed solution, electrochemistry oxidation complexing device (6) are used for with mixed solution tentatively generates under the effect of electric field waste water C that contains the precipitation of sulfate radical complex salt, stirring tank (7) are used for adding coagulant aid and make waste water C further generate after ageing contain the precipitation of sulfate radical complex salt, the stirring tank (7) is used for discharging the sulfate-containing composite complex salt precipitate, and the stirring tank (7) is used for discharging the wastewater D.
10. The method for removing sulfate radicals from wastewater by a non-membrane method according to claim 9, characterized in that: stirring pond (7) include body (71), set up water inlet (72), dosing port (73), mud discharging port (74) and produce water port (75) on body (71), water inlet (72) with electrochemistry oxidation complexing device (6) link to each other, dosing port (73) are used for throwing the coagulant aid, mud discharging port (74) are used for discharging it deposits to contain the compound complex salt of sulfate radical, it is used for discharging to produce water port (75) waste water D.
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| WO2023161675A1 (en) * | 2022-02-25 | 2023-08-31 | ADNOC Refining Research Centre | System and method for sulfate recovery from saline fluids |
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